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    <h1>Table template</h1>
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      <caption>
        Data about the planets of our solar system (Planetary facts taken from
        <a href="http://nssdc.gsfc.nasa.gov/planetary/factsheet/"
          >Nasa's Planetary Fact Sheet - Metric</a
        >).
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          <td colspan="2"></td>
          <th id="name">Name</th>
          <th id="mass">Mass (10<sup>24</sup>kg)</th>
          <th id="diameter">Diameter (km)</th>
          <th>Density (kg/m<sup>3</sup>)</th>
          <th>Gravity (m/s<sup>2</sup>)</th>
          <th>Length of day (hours)</th>
          <th>Distance from Sun (10<sup>6</sup>km)</th>
          <th>Mean temperature (°C)</th>
          <th>Number of moons</th>
          <th>Notes</th>
        </tr>
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      <tbody>
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          <th colspan="2" rowspan="4">Terrestrial planets</th>
          <th>Mercury</th>
          <td>0.330</td>
          <td>4,879</td>
          <td>5427</td>
          <td>3.7</td>
          <td>4222.6</td>
          <td>57.9</td>
          <td>167</td>
          <td>0</td>
          <td>Closest to the Sun</td>
        </tr>
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            <th>Venus</th>
            <td>4.87</td>
            <td>12,104</td>
            <td>5243</td>
            <td>8.9</td>
            <td>2802.0</td>
            <td>108.2</td>
            <td>464</td>
            <td>0</td>
            <td></td>
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            <th>Earth</th>
            <td>5.97</td>
            <td>12,756</td>
            <td>5514</td>
            <td> 9.8</td>
            <td> 24.0</td>
            <td>149.6</td>
            <td> 15</td>
            <td> 1</td>
            <td>Our world</td>
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            <th>Mars</th>
            <td>0.642</td>
            <td>6,792</td>
            <td>3933</td>
            <td> 3.7</td>
            <td> 24.7 </td>
            <td>227.9</td>
            <td> -65</td>
            <td> 2</td>
            <td>The red planet</td>
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